operator== for exprt and bool, int, nullptr_t #11179

Job	Run time
check-ubuntu-24_04-make-clang	32m 40s
check-ubuntu-24_04-make-gcc	29m 33s
check-ubuntu-24_04-cmake-gcc	27m 37s
check-ubuntu-24_04-cmake-gcc-KNOWNBUG	15m 7s
windows-msi-package	25m 13s
check-ubuntu-24_04-cmake-gcc-THOROUGH	20m 55s
check-ubuntu-22_04-cmake-gcc-32bit	26m 42s
check-docker-image	19m 47s
check-ubuntu-24_04-make-clang-smt-z3	16m 35s
check-vs-2022-make-build-and-test	6h 0m 11s
check-ubuntu-22_04-make-clang	31m 38s
check-string-table	1m 45s
check-ubuntu-22_04-cmake-gcc	26m 13s
check-vs-2025-cmake-build-and-test	53m 51s
check-macos-13-make-clang	1h 0m 9s
include-what-you-use	14m 35s
check-ubuntu-24_04-cmake-gcc-14	29m 8s
check-macos-14-cmake-clang	1h 14m 57s
check-ubuntu-24_04-arm-cmake-gcc	20m 21s
	14h 46m 57s

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